A 71kg pole-vaulter falls from rest from a height of 4.6m, Ask an Expert

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Q. A 71 kg pole-vaulter falls from rest from a height of 4.6 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.40 s after landing on the pad.

Q. What is the uncertainty in the position of an electron if it is moving with a speed of 2.05 * 10 6 m/s and the momentum is measured with a precision of 0.5%.

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